Preheat oven to 350.
Grease or parchment paper line cookie sheets. Chop the chocolate bar into small chunks, no larger than large chocolate chips, and set aside.
In a large bowl, combine cherries, chocolate chips and oats and set aside. Sift together flour, baking powder, baking soda and salt and set aside.
In a large mixing bowl, beat the butter until light and fluffy, about 3-4 minutes. Add sugars and beat the butter until creamy. Add the eggs and vanilla.
Beat the mixture until well combined, about a minute. Add the dry ingredients to the mixture and beat at low speed until well-combined, less than a minute.
Add the cherry-chocolate chip-oats mixture, and then the chopped chocolate pieces and nuts.
Using a sturdy wooden spoon, mix well by hand, until all the ingredients are thoroughly incorporated.
Drop by rounded tablespoonfuls onto the prepared cookie sheets.
Bake for 10-12 minutes, or until the cookies have set and are slightly flattened and light brown.
cool on sheets for 2 minutes, then transfer to racks to cool completely.
